JPH07213302A - Overboots - Google Patents

Abstract

PURPOSE:To realize overboots which are easy to wear and to take off, are light in weight, are foldable without bulking, do not harden in the cold, have excellent durability and prevent dissolution of shoesblack by plasticizers. CONSTITUTION:Uppers are formed by a stretchable sheet 8 formed by providing the outside surface of a synthetic fiber knitted fabric layer 6 having remarkable stretchability at least in a transverse direction with a crosslinking type polyurethane elastomer layer 7 having a thickness <=0.05mm. Shoe sole are bonded to the lower edges thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to overboots which are worn on top of ordinary shoes.

[0002]

2. Description of the Related Art Conventionally, when walking in the rain or in a muddy road, it has been practiced to wear overshoes or overboots over normal shoes. This includes those that are made of polyethylene film up to the ankle and that are worn on women's shoes, those whose uppers are rubber boots made of elastic rubber sheets, those whose uppers are made of soft vinyl chloride film, etc. There are types.

[0003]

Overshoes made of polyethylene film are lightweight and foldable so that they are not bulky to carry, but they are poor in elasticity due to poor stretchability and have a hardness depending on temperature. There are defects such as changes and poor durability. The rubber overboot has little change in hardness due to temperature, and because the upper has elasticity, it is easy to put on and take off and has good stability when worn, but it is heavy, bulky even when folded, and durable. Is not enough. The one made of soft vinyl chloride film has the weight and the bulkiness when folded in the middle of the former two, but the stretchability and durability are as bad as those made of polyethylene film, and the change in hardness due to temperature changes. Very big. In addition to this, there is a drawback that the plasticizer contained in the material migrates to the surface and melts the shoe ink.

Therefore, the present invention is intended to realize a convenient and durable overboot in which all the above-mentioned drawbacks of the overshoes and overboots are eliminated.

[0005]

The overboot according to the present invention has a thin layer of a cross-linkable polyurethane elastomer on the outer surface of a knitted fabric made of synthetic fibers such as polyester, nylon and vinylon as an upper for covering the limbs and shins. The stretchable sheet provided is used, and the bottom edge of the stretchable sheet is joined to the shoe sole.

This knitted fabric layer exhibits a large elongation rate of 30 to 100% in the width direction of the overboot. Further, the elastomer layer has a thin thickness of 0.01 mm to 0.05 mm, has an elongation rate of 100% or more, is formed into a film and is attached to the knitted fabric layer, or is in an uncrosslinked liquid state. It is laminated on the knitted fabric layer by an appropriate method such as a method of coating the knitted fabric layer with and crosslinking by heating.

[0007]

The above-mentioned overboot uses a sheet in which a thin layer of a crosslinked polyurethane elastomer is laminated on the outer side of a knitted fabric layer as an upper. This laminated sheet has excellent durability because the elastomer layer is the cross-linked polyurethane, has a very small change in hardness with temperature, and does not cause the migration phenomenon of the plasticizer. In addition, since the elastomer layer is thin, the stretchability of the knitted fabric layer remains, which makes it easy to put on and take off, has good stability during use, is lightweight, and can be folded small so as not to be bulky.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 2 to 4, reference numeral 1 denotes an upper, the left half 1L and the right half 1R of which are sewn at the central suture lines 7 and 3 on the front surface and the back surface, and a stretchable waterproof tape is sewn thereon. 4 and 5 are attached to each other. As shown in the enlarged cross section in FIG. 1, each of the halves 1R and 1L is made of a stretchable sheet 8 in which an elastomer film layer 7 is laminated on the outer surface of a knitted fabric layer 6, and 9 is along the suture line 2 or 3. Indicates sewing thread.

The knitted fabric layer 6 is formed by braiding 60 denier polyester yarn at a density of about 20 yarns / cm in the transverse direction and about 20 yarns / cm in the longitudinal direction. About 10% in the longitudinal direction and about 10% in the transverse direction. 100% elongation is possible. The elastomer film layer 7 is made of a cross-linked polyurethane having a thickness of 0.013 mm and exhibits elongation of 400 to 500%. This is bonded to the knitted fabric layer 6 using a polyurethane adhesive. The resulting laminated sheet is capable of stretching about 10% in the machine direction and about 70% in the cross direction.

The stretchable waterproof tapes 4 and 5 are made of a cross-linkable polyurethane elastomer film (thickness: 0.05-0.
2 mm) with a thin layer of non-crosslinking type polyurethane elastomer provided on one side, and only the non-crosslinking type thin layer is dissolved by heating, and the elastomer film layer 7 of the sheet 8 is formed.
Weld to.

An edge tape 10 is attached to the lower edge of the upper 1, and the shoe sole 11 is adhered by an adhesive via the edge tape 10. The edge tape 10 has a thickness of 0.
A thin layer of non-crosslinked polyurethane elastomer is laminated on one side of a sheet of crosslinked polyurethane elastomer of 2 to 0.3 mm, and the edge tape 10 can be welded to the elastomer film 7 of the sheet 8 by heating. A heel reinforcing sheet 12 made of the same sheet as the edge tape 10 is welded to the lower rear portion of the upper 1 by the same method.

The upper edge of the upper 1 is sewn into a tubular shape to form a string passing portion 13, and both ends of the string 14 inserted through the string passing portion 13 are
The eyelets 15 are provided on the front surface of the stringing portion 13 and are led out to the outside world. On the side of the ankle part of the upper 1, a tightening band 16 made of a sheet of the same quality as the upper 1,
The waterproof tapes 4 and 5 are attached by the same tapes 16 and 17. Cloth fasteners 18 and 19 are attached to the vicinity of the attachment portion and the tip portion of the tightening band 16, respectively.

The above overboots are easy to put on and take off due to the fact that the inner surface of the upper is slippery by the knitted fabric layer and that the upper boots expand and contract well in the width direction. Further, the material of the upper is extremely light and flexible, and the fact that it can be brought into close contact with the shin by means of the cord and the tightening band makes it possible to walk extremely lightly. Also, it can be folded small, which is convenient for carrying and storing. Furthermore, the upper material is highly durable, and there is almost no change in hardness with temperature,
It does not have the problem of surface migration of plasticizers found in PVC products.

Therefore, the following table shows a comparison between the products using various conventional materials described above and the products of the present invention in terms of various properties. The circles are good, the triangles are a little bad,
A cross indicates a defect.

[Table 1]

[0015]

As described above, according to the present invention,
It eliminates the drawbacks of conventional overshoes and overboots, is easy to put on and take off, is lightweight, can be folded so as not to be bulky, does not become hard in cold weather, is durable and has a plasticizer It is possible to realize convenient overboots without melting.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a joined portion of an upper member according to the present invention.

FIG. 2 is a front view of an overboot embodying the present invention.

FIG. 3 is a side view of the overboot shown in FIG.

4 is a rear view of the overboot shown in FIG. 1. FIG.

[Explanation of symbols]

 1 Upper 1R Upper right half 1L Upper left half 2 and 3 Suture line 4 and 5 Stretchable waterproof tape 6 Knitted fabric layer 7 Crosslinkable polyurethane elastomer layer 8 Stretchable sheet 9 Sewing thread 10 Edge tape 11 Sole 13 Threading part 14 string 16 tightening band 18 and 19 cloth fastener

Claims (9)

[Claims] 1. A thickness of 0.05 m on the outer surface of the synthetic fiber knitted fabric layer.
An overboot comprising an upper made of a stretchable sheet having a cross-linked polyurethane elastomer layer of m or less and a shoe sole joined to a lower end edge thereof. 2. The upper has elastic sheets in the left and right halves that are separately cut, and are sewn to each other at the center of the front surface and the center of the back surface, and the outer surface of the sewn portion is made of a crosslinked polyurethane elastomer. Stretchable waterproof tape is attached, The over boots of Claim 1 characterized by the above-mentioned. 3. The overboot according to claim 1, wherein the elastic sheet has elasticity at least in a width direction of the overboot. 4. The stretchable waterproof tape comprises a cross-linked polyurethane elastomer film having a thickness of 0.2 mm or less, and a thin layer of the non-crosslinked polyurethane elastomer laminated on the film. The overboot according to claim 2, wherein the overboot is joined to the crosslinked polyurethane elastomer layer of the stretchable sheet by fusion bonding. 5. The overboot according to claim 1, wherein the upper has binding means for binding the shin on the upper edge thereof. 6. A tubular cord passing portion is formed at an upper edge of the upper, and a tightening cord whose both ends are led to the outside is inserted in the cord passing portion. The overboot according to claim 1. 7. The overboot according to claim 1, wherein the upper has a height reaching the upper part of the shin calf. 8. The overboot according to claim 7, wherein the upper has binding means at the upper edge and the ankle portion, respectively. 9. An edge tape formed by laminating a thin layer of a non-crosslinked polyurethane elastomer on a sheet of a crosslinked polyurethane elastomer along the lower edge of the upper, wherein the non-crosslinked polyurethane elastomer thin layer is heated. The cross-linked polyurethane elastomer layer of the stretchable sheet is joined by fusion, and the shoe sole formed of rubber or a synthetic resin elastomer is adhered to the cross-linked polyurethane elastomer sheet of the edge tape. Overboots described in 1.